How to remove mould from walls
Mould on walls can be unsightly and unhealthy, so it's important to remove it promptly. Here's a guide on how to do it safely and effectively:
Before you start, safety first!
- Ventilation: Open windows and doors to ensure good airflow.
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Protection: Wear protective gear including:
- Rubber gloves
- A face mask (to avoid inhaling mould spores)
- Eye protection (goggles)
- Old clothes you don't mind getting stained or throwing away.
Methods for removing mould:
There are several effective solutions, from household products to dedicated mould removers.
1. Bleach and Water Solution (for non-porous surfaces): This is a common and effective method for killing mould and bleaching stains on hard, non-porous surfaces.
- Mix: Combine one part bleach with four parts water in a spray bottle or bucket.
- Apply: Spray or wipe the solution directly onto the mouldy area.
- Scrub: Gently scrub until the mould is gone.
- Rinse and Dry: Wipe away the bleach mixture with a clean, damp cloth and then thoroughly dry the area with a separate clean cloth.
Important Note: Bleach can damage porous surfaces like drywall, and it only kills surface mould, not necessarily the roots. It also emits strong fumes. NEVER mix bleach with vinegar or ammonia, as this creates dangerous toxic gases.
2. White Vinegar: Vinegar is a natural and non-toxic option that can kill a significant percentage of mould species.
- Apply: Pour undiluted white vinegar into a spray bottle and spray it directly onto the mould.
- Wait: Let it sit for at least an hour to allow the vinegar to penetrate and kill the mould.
- Scrub and Rinse: Scrub with a brush or cloth, then rinse the area with clean water.
- Dry: Dry the surface completely.
3. Baking Soda: Baking soda is a mild, non-toxic cleaner and natural fungicide. It can also help absorb odors.
- Paste: Mix baking soda with water to form a thick paste.
- Apply: Apply the paste to the mouldy area.
- Scrub: Scrub with a brush or cloth.
- Rinse: Rinse the area with clean water.
- Prevent Recurrence: You can spray a light solution of baking soda and water (1/4 teaspoon baking soda to 2 cups of water) onto the area after cleaning to help prevent mould from returning.
4. Commercial Mould Removers: Many effective mould removal sprays are available at supermarkets and DIY stores. These are specifically designed for mould and often contain antifungal agents.
- Read Instructions: Always follow the manufacturer's instructions carefully for application and safety.
- Test: Test the product in an inconspicuous area first to ensure it doesn't damage your wall surface.
General Tips for All Methods:
- Don't scrub dry mould: This can release spores into the air, spreading the problem.
- Be thorough: Extend your cleaning beyond the visible mould to catch invisible spores.
- Dispose of cleaning materials: Place used cloths and sponges in a plastic bag, seal it tightly, and discard it in an outside bin to prevent spore spread.
- Vacuum the area: After cleaning, vacuum the room to remove any lingering spores.
Preventing Mould Recurrence (The Most Important Step!):
Removing mould is only a temporary solution if you don't address the underlying cause. Mould thrives in damp, humid environments. To prevent it from returning:
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Improve Ventilation:
- Open windows regularly, especially in moisture-prone areas like bathrooms and kitchens.
- Use extractor fans when showering, bathing, or cooking.
- Consider installing a whole-house ventilation system for persistent issues.
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Reduce Moisture:
- Fix any leaks in pipes, roofs, or around windows.
- Wipe down wet surfaces (e.g., shower walls) after use.
- Avoid drying clothes indoors if possible, or use a dehumidifier in a well-ventilated room.
- Keep humidity levels below 60%. Dehumidifiers can help.
- Insulation: Ensure your home is well-insulated to prevent cold spots where condensation can form.
- Anti-Mould Paint: For areas prone to mould, consider using anti-mould paint or adding a mould-inhibiting additive to regular paint.
- Regular Checks: Periodically check areas prone to mould growth and address any signs promptly.
When to call a professional:
If you have a large area of mould (more than a few square feet), suspect hidden mould, or if the mould keeps returning despite your efforts, it's best to consult a professional mould remediation specialist. They can identify the source of the moisture and safely remove extensive mould growth.
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